Check out the thread “installed speaker components” a few posts down on this page. He states the wire colors. I’m sure you can tap in behind the plastic on the B-pillar. I’m going to be doing this eventually. Just need to get around and get proper fuse holder for the powder cable. I have spare cable laying around so that’s why i only need that. But this is my plan anyways.

I will get you the exact wires tomorrow. I posted in that thread the driver side rear door. Forgot to post the passenger side and I can’t remember the colors but know what wires they are on that side. I spliced in on Sunday as i had free time used a set of RCA cables I had laying around instead of wiring into the Speaker level inputs on my Alpine amp.